TCA4311DG4 Texas Instruments Integrated Circuit (Other) In Stock
Texas Instruments TCA4311DG4 is a hot-swappable 2-wire I2C bus buffer that isolates capacitance during card insertion, operating from 2.7V to 5.5V supply in a compact 8-pin SOIC package. In stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- TCA4311DG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TCA4311DG4?
- Hot-swap protection for I2C/SMBus lines: clamps and isolates bus capacitance during live board insertion, preventing glitches on the upstream 2-wire bus without requiring power-cycle resets
- Wide 2.7V to 5.5V supply range with bidirectional buffering supports both 3.3V and 5V I2C systems, enabling seamless mixed-voltage bus segment isolation in embedded and server platforms
- 8-pin SOIC package with minimal external components reduces PCB footprint in space-constrained hot-plug backplane, DIMM, and blade server designs
What is TCA4311DG4 used for?
The TCA4311DG4 is designed for hot-plug I2C bus applications in server backplanes, blade servers, DIMM modules, and industrial modular control systems where boards must be inserted or removed without disturbing active I2C/SMBus communication. Its bidirectional buffering and capacitance isolation prevent glitches on the host bus during live insertion, protecting connected sensors, EEPROMs, and PMBus power controllers operating at 2.7V to 5.5V. It is also used in multi-segment I2C bus extension designs where each segment must be independently manageable.
What are the specifications of TCA4311DG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Interface IC Type | BUS BUFFERS |
| JESD-30 Code | R-PDSO-G8 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 2.7V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Technology | BICMOS |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.01 |
Where can I find the TCA4311DG4 datasheet?
TCA4311DG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TCA4311DG4?
Compatible alternatives and drop-in replacements for TCA4311DG4:
Frequently Asked Questions
How does TCA4311DG4 protect an I2C bus during hot-swap card insertion?
During hot-plug insertion, the TCA4311DG4 clamps the downstream bus segment and prevents abrupt capacitive loading from propagating to the upstream I2C bus. This isolation holds the upstream SCL and SDA lines stable within the 2.7V to 5.5V operating range, avoiding spurious start conditions or data corruption that would otherwise occur when adding a new card with up to hundreds of picofarads of bus capacitance.
Can TCA4311DG4 interface 3.3V and 5V I2C segments in the same system?
Yes, the TCA4311DG4 supports both 3.3V and 5V I2C segments across its 2.7V to 5.5V supply range, allowing level-compatible bidirectional buffering between mixed-voltage bus segments. This is especially useful in server management systems where legacy 5V SMBus controllers must interface with modern 3.3V baseboard management controllers (BMCs) managing multiple sensor and EEPROM devices.
What package does TCA4311DG4 use, and how small is its PCB footprint?
The TCA4311DG4 is housed in an 8-pin SOIC package (PDSO-G8) with approximately 4.9mm x 3.9mm body dimensions, delivering a very compact PCB footprint for a bus buffer IC. This small size allows it to fit directly adjacent to I2C connectors on hot-plug backplanes with minimal routing distance, keeping bus stub lengths under 50mm to maintain signal integrity at 400kHz Fast-mode I2C.
In which server or industrial applications is TCA4311DG4 most commonly deployed?
TCA4311DG4 is most commonly deployed in 1U and 2U server hot-plug backplanes, blade server midplanes, and DIMM socket designs where live insertion of memory modules or mezzanine cards is required. It is also used in industrial modular PLCs, telecom line cards, and medical diagnostic equipment with 2-wire sensor buses operating at 2.7V to 5.5V, where isolation of individual 8-pin bus segments prevents system-wide I2C bus hangs.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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